JPH0345854B2 - - Google Patents
Info
- Publication number
- JPH0345854B2 JPH0345854B2 JP58018311A JP1831183A JPH0345854B2 JP H0345854 B2 JPH0345854 B2 JP H0345854B2 JP 58018311 A JP58018311 A JP 58018311A JP 1831183 A JP1831183 A JP 1831183A JP H0345854 B2 JPH0345854 B2 JP H0345854B2
- Authority
- JP
- Japan
- Prior art keywords
- relay
- circuit
- power supply
- relay coil
- voltage
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
- 238000012544 monitoring process Methods 0.000 claims description 5
- 238000010586 diagram Methods 0.000 description 11
- 230000007257 malfunction Effects 0.000 description 6
- 230000000694 effects Effects 0.000 description 1
- 238000004886 process control Methods 0.000 description 1
- 230000002123 temporal effect Effects 0.000 description 1
- 230000001052 transient effect Effects 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
Landscapes
- Relay Circuits (AREA)
Description
【発明の詳細な説明】
この発明はプラントのプロセス制御を行う計算
機やシーケンサからプラント側へ接点信号を出力
するためのリレーを駆動するリレー駆動装置に関
するものである。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a relay driving device that drives a relay for outputting a contact signal from a computer or sequencer that performs process control of a plant to the plant side.
従来この種の装置として第1図に示すものがあ
つた。図においてK1はリレーコイル、k1はそ
のリレー接点、IC1はドライバ、D1はダイオ
ード、Vccは電源、CUTは接点出力である。ダイ
オードD1はリレーコイルK1内における電流の
時間的変化により発生する逆起電力を吸収するた
めに設けられている。 A conventional device of this type is shown in FIG. In the figure, K1 is a relay coil, k1 is its relay contact, IC1 is a driver, D1 is a diode, Vcc is a power supply, and CUT is a contact output. Diode D1 is provided to absorb back electromotive force generated due to temporal changes in current within relay coil K1.
ドライバIC1の出力の電位レベルは、第1図
にSで示す入力の論理によつて定まり“L”レベ
ルになつた時はVccからリレーコイルK1を経て
電流が流れ、接点のNC−C間が開きNO−C間
が閉じる。一方、ドライバIC1の出力が“H”
レベルになるとリレーコイルK1には電流が流れ
ず、接点NC−C間が閉じ、NO−C間が開く。 The potential level of the output of the driver IC1 is determined by the logic of the input shown by S in Figure 1. When it reaches the "L" level, a current flows from Vcc through the relay coil K1, and the current flows between the contacts NC and C. opens and the space between NO and C closes. On the other hand, the output of driver IC1 is “H”
When the level is reached, no current flows through the relay coil K1, contacts NC and C are closed, and contacts NO and C are opened.
しかし、Vccが正規の電圧でない場合はリレー
の開閉に誤動作が発生する。第2図は第1図の装
置における誤動作の発生を示す波形図であり、横
軸は時間を示し、第2図aはVccの、同図bはド
ライバIC1の出力電圧の、同図cは接点出力
OUTの、それぞれ時間的経過を示す。 However, if Vcc is not the normal voltage, malfunctions will occur when the relay opens and closes. FIG. 2 is a waveform diagram showing the occurrence of a malfunction in the device shown in FIG. 1. The horizontal axis shows time, and FIG. is contact output
Each shows the time course of OUT.
電源が投入されてVccが0から立上つて正規の
電圧に達し、次に電源がしや断されてVccが正規
の電圧から0に戻る状態を第2図aに示してい
る。第2図aにおいてVKはリレーが動作するこ
とのできる閾値電圧、VEは電子回路が正常に動
作する閾値電圧を示す。普通の場合VE>VKであ
つて、VK〜VEの領域では第1図の信号Sの論理
が誤りその結果IC1の出力の電位レベルが誤り、
又は信号Sの論理が正規であつてもIC1の出力
の電位レベルが正規でなく、しかもリレーが動作
し得る電圧値VKを越しているので、誤つた接点
出力OUTが出力されることがある。 FIG. 2a shows a state in which the power is turned on and V cc rises from 0 to reach the normal voltage, and then the power is turned off and V cc returns from the normal voltage to 0. In FIG. 2a, V K indicates a threshold voltage at which the relay can operate, and V E indicates a threshold voltage at which the electronic circuit operates normally. In the normal case, V E > V K , and in the region from V K to V E , the logic of the signal S in Fig. 1 is incorrect, and as a result, the potential level of the output of IC1 is incorrect.
Or, even if the logic of the signal S is normal, the potential level of the output of IC1 is not normal and exceeds the voltage value V K at which the relay can operate, so an incorrect contact output OUT may be output. .
第2図に示す例では、信号Sの制御によつて接
点出力OUTを“OFF”状態に保つよう制御して
いる場合、電源Vccの変化の過渡状態において接
点出力OUTが“ON”状態になることがあるこ
とを第2図cで示している。 In the example shown in Figure 2, if the contact output OUT is controlled to be kept in the "OFF" state by controlling the signal S, the contact output OUT will be in the "ON" state in a transient state of a change in the power supply V cc . This is shown in Figure 2c.
従来のリレー駆動装置は以上のように構成され
ており、電源投入およびしや断時の誤動作を完全
に防止することはできず、接点出力OUTが誤つ
ても重大な事故が発生することがないようにする
ためには、接点出力OUT以後にフエイルセーフ
(fail−safe)回路を設ける等の対策を講じなけれ
ばならぬという欠点があつた。 Conventional relay drive devices are configured as described above, and it is not possible to completely prevent malfunctions when the power is turned on or off, and even if the contact output OUT is incorrect, serious accidents will not occur. In order to do this, there is a drawback that measures must be taken such as providing a fail-safe circuit after the contact output OUT.
この発明は上記のような従来のものの欠点を除
去するためになされたもので、電子回路が誤動作
する電源電圧領域ではリレーコイルへの電源の供
給をカツトオフ状態に保つトランジスタスイツチ
回路を設けることによつて、電源投入およびしや
断の過渡期においてもリレーの接点が誤出力され
ることのないようにしたリレー駆動装置を提供す
ることを目的としている。 This invention was made in order to eliminate the above-mentioned drawbacks of the conventional ones, and by providing a transistor switch circuit that keeps the power supply to the relay coil in a cut-off state in the power supply voltage range where the electronic circuit malfunctions. Accordingly, it is an object of the present invention to provide a relay drive device that prevents relay contacts from being erroneously output even during the transition period of power-on and power-off.
以下、図面についてこの発明の実施例を説明す
る。第3図はこの発明の一実施例を示すブロツク
図で、第1図と同一符号は同一又は相当部分を示
し、10は電圧低下時カツトオフ回路である。ま
た、第4図は第3図の電圧低下時カツトオフ回路
10の設計例を示す接続図で、第3図と同一符号
は同一部分を示し、D2はカツトオフする電圧を
設定するためのツエナーダイオード、R1はツエ
ナーダイオードD2の電流制限抵抗、TR1はス
イツチ回路として動作するトランジスタ、R2は
トランジスタTR1のベース抵抗である。 Embodiments of the invention will be described below with reference to the drawings. FIG. 3 is a block diagram showing an embodiment of the present invention, in which the same reference numerals as in FIG. 1 indicate the same or corresponding parts, and 10 is a cut-off circuit at the time of voltage drop. 4 is a connection diagram showing a design example of the voltage drop cut-off circuit 10 shown in FIG. 3, where the same reference numerals as in FIG. 3 indicate the same parts, and D2 is a Zener diode for setting the cut-off voltage; R1 is a current limiting resistance of the Zener diode D2, TR1 is a transistor that operates as a switch circuit, and R2 is a base resistance of the transistor TR1.
Vccの電圧値が第2図に示すVEよりも少し高い
VDにおいてツエナダイオードD2に電流が流れ
るように設定しておくと、VccがVD以下ではツエ
ナダイオードD2に電流が流れず、したがつてト
ランジスタTR1のベース電流が流れず、トラン
ジスタTR1はカツトオフ状態になつており、リ
レーコイルK1には電圧が供給されない。 The voltage value of V cc is slightly higher than V E shown in Figure 2.
If the setting is made so that current flows through the Zener diode D2 at V D , no current will flow through the Zener diode D2 when V cc is less than V D , so the base current of the transistor TR1 will not flow, and the transistor TR1 will be cut off. state, and no voltage is supplied to relay coil K1.
第5図は第4図におけるリレーコイルK1に加
えられる電圧を示す波形図で、第5図aはVccを、
同図bはリレーコイルK1に印加される電圧を示
す。第5図のVDは第2図のVEに対しVDVEに設
定してあるのでVcc<VEの領域で電子回路が誤動
作しても誤つた接点出力OUTが出力されること
はない。 FIG. 5 is a waveform diagram showing the voltage applied to the relay coil K1 in FIG. 4, and FIG. 5 a shows V cc ,
Figure b shows the voltage applied to the relay coil K1. Since V D in Figure 5 is set to V D V E compared to V E in Figure 2, even if the electronic circuit malfunctions in the region of V cc < V E , an incorrect contact output OUT will be output. There isn't.
第6図はこの発明の他の実施例を示すブロツク
図で、第3図と同一符号は同一又は相当部分を示
し、Vcc1はリレー駆動装置、Vcc2は電子回路駆動
電源、11はリレー電源のカツトオフ回路、12
は電子回路電源の監視回路である。 FIG. 6 is a block diagram showing another embodiment of the present invention, in which the same reference numerals as in FIG. 3 indicate the same or corresponding parts, V cc1 is a relay drive device, V cc2 is an electronic circuit drive power supply, and 11 is a relay power supply. cut-off circuit, 12
is a monitoring circuit for the electronic circuit power supply.
第6図のようにリレー駆動電源Vcc1と電子回路
駆動電源Vcc2とが別のものである場合にはVcc2を
監視して、Vcc2が所定値より低くなつた場合Vcc1
をしや断すればよい。第4図においてR1とD2
の直列回路が監視回路12を構成し、TR1と
TR1のベース抵抗R2とがカツトオフ回路11
を構成し、R1とD2の接続点からR2への接続
線が監視回路12からカツトオフ回路11の制御
線となる。 As shown in Fig. 6, when the relay drive power supply V cc1 and the electronic circuit drive power supply V cc2 are different, V cc2 is monitored, and when V cc2 becomes lower than a predetermined value, V cc1 is
All you have to do is refuse. In Figure 4, R1 and D2
The series circuit of constitutes the monitoring circuit 12, and the series circuit of TR1 and
The base resistance R2 of TR1 is the cut-off circuit 11
The connection line from the connection point of R1 and D2 to R2 becomes the control line from the monitoring circuit 12 to the cutoff circuit 11.
また、この発明はラツチングリレーを駆動する
リレー駆動装置に応用できることは申すまでもな
く、ホトカツプラの出力回路に利用しても同様の
効果を得ることができる。 Furthermore, it goes without saying that the present invention can be applied to a relay driving device for driving a latching relay, and similar effects can be obtained when applied to an output circuit of a photocoupler.
以上のようにこの発明によれば、電子回路が誤
動作することのある電圧領域では、リレーコイル
への電源をカツトオフするように制御するので、
リレー駆動装置の電源投入およびしや断時の誤出
力を防止することができ、総合的に見て装置全体
の簡単化と低価格化を実現することができる。 As described above, according to the present invention, the power supply to the relay coil is controlled to be cut off in a voltage range where the electronic circuit may malfunction.
It is possible to prevent erroneous outputs when the power of the relay drive device is turned on and off, and overall, it is possible to realize simplification and cost reduction of the entire device.
第1図は従来の装置を示す接続図、第2図は第
1図の装置における各部の動作を示す波形図、第
3図はこの発明の一実施例を示すブロツク図、第
4図は第3図の電圧低下時カツトオフ回路の設計
例を示す接続図、第5図は第3図の装置における
各部の動作を示す波形図、第6図はこの発明の他
の実施例を示すブロツク図である。
K1……リレーコイル、IC1……ドライバ、
TR1……トランジスタ、D2……ツエナダイオ
ード、k1……リレー接点。なお、図中同一符号
は同一又は相当部分を示す。
FIG. 1 is a connection diagram showing a conventional device, FIG. 2 is a waveform diagram showing the operation of each part in the device shown in FIG. 1, FIG. 3 is a block diagram showing an embodiment of the present invention, and FIG. Figure 3 is a connection diagram showing a design example of a cut-off circuit at the time of voltage drop, Figure 5 is a waveform diagram showing the operation of each part in the device of Figure 3, and Figure 6 is a block diagram showing another embodiment of the present invention. be. K1...Relay coil, IC1...Driver,
TR1...Transistor, D2...Zena diode, k1...Relay contact. Note that the same reference numerals in the figures indicate the same or equivalent parts.
Claims (1)
ー駆動装置において、上記電子回路に供給される
電源の電圧があらかじめ定めた電圧値以上である
か否かを検出する監視回路と、上記リレーコイル
に直列に接続され制御信号により上記リレーコイ
ルの電流をオンオフ制御するトランジスタと、上
記監視回路において上記電子回路に供給される電
源の電圧が上記あらかじめ定めた電圧値以上でな
いことを検出したときは制御信号を出力して上記
トランジスタをオフ状態に制御する手段とを備え
たことを特徴とするリレー駆動装置。1. In a relay drive device that drives a relay coil using an electronic circuit, a monitoring circuit that detects whether the voltage of the power supply supplied to the electronic circuit is equal to or higher than a predetermined voltage value is connected in series to the relay coil. and a transistor that controls on/off the current of the relay coil by a control signal, and a control signal is output when the monitoring circuit detects that the voltage of the power supply supplied to the electronic circuit is not higher than the predetermined voltage value. and means for controlling the transistor to an OFF state.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP58018311A JPS59143231A (en) | 1983-02-07 | 1983-02-07 | Relay drive unit |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP58018311A JPS59143231A (en) | 1983-02-07 | 1983-02-07 | Relay drive unit |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS59143231A JPS59143231A (en) | 1984-08-16 |
JPH0345854B2 true JPH0345854B2 (en) | 1991-07-12 |
Family
ID=11968061
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP58018311A Granted JPS59143231A (en) | 1983-02-07 | 1983-02-07 | Relay drive unit |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS59143231A (en) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE3908192A1 (en) * | 1989-03-14 | 1990-09-20 | Licentia Gmbh | ELECTRONIC CONTACTOR CONTROL |
Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5553026A (en) * | 1978-10-16 | 1980-04-18 | Hitachi Ltd | Output relay switching circuit |
-
1983
- 1983-02-07 JP JP58018311A patent/JPS59143231A/en active Granted
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5553026A (en) * | 1978-10-16 | 1980-04-18 | Hitachi Ltd | Output relay switching circuit |
Also Published As
Publication number | Publication date |
---|---|
JPS59143231A (en) | 1984-08-16 |
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